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中文摘要：
针对RB-HARQ协议系统开销巨大的问题，提出一种基于校验式判决的HARQ协议。该协议根据不成立的校验式与错误比特之间的关系，将一部分不成立的校验武的序号通过反馈信道反馈给发射机，发射机按照一定的规则将这些校验武所包含的某些比特确定为重传比特，重新发送给接收端，接收端将重传的比特与先前发送的码字进行最大比合并，最后进行译码。数值仿真结果表明，由于只需要反馈一部分校验武的序号，该协议能够有效降低系统的开销，其吞吐量性能能够接近RB-HARQ协议。
英文摘要：
In consideration of the problem that the reliability-based hybrid automatic repeat request （RB-HARQ） protocol brings a coding system a heavy load, the paper proposes a so-called HARQ protocol based on parity-check syndromes for coding of low density parity check （LDPC） codes. The protocol fed some ordinal numbers of the unsatisfied syndromes back to the transmitter through the feedback channel according to the relation of the unsatisfied syndromes to the bits in error, and then the transmitter determines the repeat bits according to a given rule. In the receiver side, the maximum ratio combining （MRC） combined codeword is decoded by LDPC decoder. The simulation results shows that this new protocol can reduce the overload because only some ordinal numbers of syndromes are needed for retransmission, and the throughout can approach that of the RB-HARQ protocol.
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